Set LDAP Samples to Use Zero Port

Issue gh-8762

samples/javaconfig/ldap/src/main/java/org/springframework/security/samples/config/SecurityConfig.java

@@ -29,7 +29,8 @@ public class SecurityConfig {
 		auth
 			.ldapAuthentication()
 				.userDnPatterns("uid={0},ou=people")
-				.groupSearchBase("ou=groups");
+				.groupSearchBase("ou=groups")
+				.contextSource().port(0);
 	}
 	// @formatter:on
-}
+}

samples/xml/ldap/src/main/webapp/WEB-INF/applicationContext-security.xml

@@ -17,7 +17,7 @@
 
 	<!-- Simple namespace-based configuration -->
 
-	<s:ldap-server ldif="classpath:users.ldif"/>
+	<s:ldap-server ldif="classpath:users.ldif" port="0"/>
 
 	<s:authentication-manager>
 		<s:ldap-authentication-provider